Mon Prof Augmenté
Small and large vibrating surfaces
Age 13 · Physics
A small surface vibrates quickly and makes a high pitch, while a large surface vibrates more slowly and makes a low pitch. A loudspeaker uses a small tweeter and a big woofer, and a violin plate works in the same way.
This picture is part of the full library
Every lesson is open to everyone for 7 days after it is published. This one came out on November 2, 2026: its text stays readable here, and its picture opens with a subscription.
The app is free. A subscription opens every lesson, in every school year.
Age 13: open this week
Browse Age 13
In the picture
- Tweeter cone: a small surface that makes high sounds
- Woofer cone: a large surface that makes low sounds
- Small patch of the violin plate: it vibrates for high notes
- Long zone along the bass bar: it vibrates for low notes
Examples
- A speaker with a small tweeter for whistles and a big woofer for drums
- A violin, where thin strings sound high and thick strings sound low
Key takeaways
- Small vibrating surface: high pitch
- Large vibrating surface: low pitch
Quiz: Small and large vibrating surfaces (Age 13)
-
A surface that vibrates is small. What kind of pitch does it make?
-
In a loudspeaker, which part is big and makes the low sounds?
-
On a violin plate, which area vibrates to make low notes?
The answers, each with its explanation, are in the app. This lesson has left the free week, so its quiz is part of the subscription.
Free app, optional subscription
App Store Google Play
Carry on in the app
At least one new illustrated lesson every weekday for your child’s year, with its quiz and a reminder at 6:15 pm.
Your child’s teacher does not use My Enhanced Teacher yet?
Tell them about it
